Panasonic U-4LE1E5, Service Manual, Page: 119 / 133

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5
Mini VRF SYSTEM
Trouble Diagnosis
3. Mini VRF System Alarm Codes
P03 Compressor Discharge Temperature Error
Error Detection Method
Error Diagnosis
1.
2.
When the discharge temperature is over 106°C. •
1-1
1-2
2-1
2-2
Adjust the
refrigerant amount
Replace CR board
Yes
No
1 Adjustment
to
refrigerant
charge
Yes
No
2-2
2-3
2-4
Avoid clogging
2-3
2-4
Replace the
electronic control
valve
Yes
No
2 Blockage in
refrigerant
circuit
Yes
No
Tends to have insufficient refrigerant charge in the system.
Service valve inside the outdoor unit closed
Additional
refrigerant charge
2-2
Yes
No
Open service valve
Replace CR board
Yes
No
Replace the strainer
Are the tubes clogged?
Is the outdoor unit’s electronic control valve operating correctly?
(Check for debris clogging the electronic control valve, a problem
with the electronical coil and/or the control PC board.)
Is it observable difference in status of the dew or frost between
the strainer’s primary and secondary sides?
Not additional refrigerant charged
SM830195-01̲Mini VRF SYS.indb 39 SM830195-01̲Mini VRF SYS.indb 39 2011/12/20 16:32:53 2011/12/20 16:32:53